跪求解答GMAT逻辑 GWD-18-Q16GWD-18-Q16Aroca City currently funds its public schools through taxes on property. In place of this system, the city plans to introduce a sales tax of three percent on all retail sales in the city. Critics protest t

跪求解答GMAT逻辑 GWD-18-Q16GWD-18-Q16Aroca City currently funds its public schools through taxes on property. In place of this system, the city plans to introduce a sales tax of three percent on all retail sales in the city. Critics protest t
跪求解答GMAT逻辑 GWD-18-Q16
GWD-18-Q16
Aroca City currently funds its public schools through taxes on property. In place of this system, the city plans to introduce a sales tax of three percent on all retail sales in the city. Critics protest that three percent of current retail sales falls short of the amount raised for schools by property taxes. The critics are correct on this point. Nevertheless, implementing the plan will probably not reduce the money going to Aroca’s schools. Several large retailers have selected Aroca City as the site for huge new stores, and these are certain to draw large numbers of shoppers from neighboring municipalities, where sales are taxed at rates of six percent and more. In consequence, retail sales in Aroca City are bound to increase substantially.
In the argument given, the two potions in boldface play which of the following roles?
A.\x05The first presents a plan that the argument seeks to defend against a certain criticism; the second gives part of the basis for that criticism.
B.\x05The first presents a plan that the argument seeks to defend against a certain criticism; the second gives part of the basis for that defense.
C.\x05The first presents a plan that the argument criticizes; the second is a consideration raised by the argument in support of that criticism.
D.\x05The first presents a plan that the argument criticizes; the second presents a consideration that has been raised against that criticism.
E.\x05The first presents a plan whose consequences the argument seeks to evaluate; the second is presented by the argument as one likely consequence that is undesirable.
CDE选项都可以顺利排出掉,主要是AB选项比较纠结.这题里defend against怎么理解啊?还有AB到底有什么差别啊?
求NN帮助,感激不尽~~~
In place of this system, the city plans to introduce a sales tax of three percent on all retail sales in the city.
Several large retailers have selected Aroca City as the site for huge new stores, and these are certain to draw large numbers of shoppers from neighboring municipalities,
这两句是BOLDFACE.

跪求解答GMAT逻辑 GWD-18-Q16GWD-18-Q16Aroca City currently funds its public schools through taxes on property. In place of this system, the city plans to introduce a sales tax of three percent on all retail sales in the city. Critics protest t
答案是B
首先,相信CDE都可以顺利排除,这个就不多说了
第二,本文作者是赞成引进“销售税”代替财产税的,但反对者称目前的销售量小了,销售能负担的税收没有财产税那么多
第三,Boldface第二句作者又说有一些大型零售商已经决定在A市开大型商场,而且有望吸引周边城市的消费者,言下之意A市的销售量会上升,所以是作者自己观点的一个论据啦（defense）
defend against a certain criticism：应对某一批评的自我辩护
很简单的,AB的区别就在于A说第二句是支持批评者的观点,B说第二句是支持作者自己的观点
建议LZ做逻辑的时候画逻辑树,我就是这样的,这个方法很有用!